Why might a button be 'greyed out' on the ribbon in SharePoint 2010?

Question:Why might a button be 'greyed out' on the ribbon in SharePoint 2010?

1.The feature is not enabled for the site. For example, workflows may not be enabled on the site.

2.The action is not applicable or it depends on some other action, e.g. contextual

3.All of these

4.You do not have permission to complete the task.


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